Some lifespan info for you. I fitted Osram Cool Intense (H15) and Phillips X-treme Vision 130 (H7) bulbs in Nov 2015, they've not been replaced yet....
2013 Touran SE 2.0 TDI-CR (CFHC - D91) DSG (PBF -G1A) Acapulco Blue Metallic, Retro Fit Front Fog lights, Westfalia Detachable Towbar
2015 Skoda Fabia SE (Mk3) 1.2 TSI(110) DSG Silver. ( I was previously posting as thamestrader)